To file a motion to dismiss, you draft and file a written motion in the court where the lawsuit is pending, before your answer is due, identifying one or more legal grounds the rules recognize and asking the court to throw the case out. In federal court, your response to a complaint is due 21 days after service, so this decision moves fast. The motion itself pauses the answer deadline, which is one reason many defendants use it even when the strongest defenses will take longer to develop.
When the Motion Has to Be Filed
A motion to dismiss must be filed before your answer. You cannot answer the complaint first and then move to dismiss later.
The default federal deadline is 21 days after you are served with the summons and complaint. If you waived formal service, the window extends to 60 days, or 90 days if you were served outside the United States. Filing the motion pauses your answer deadline. If the court later denies the motion, you have 14 days from notice of the ruling to file your answer, unless the court sets a different date.1Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Section: (a)(4)(A)
State courts run on their own timetables. Check the local rules before assuming any federal deadline applies to your case.
Grounds the Rules Recognize
A motion to dismiss cannot be a general objection to the lawsuit. It has to rest on specific legal grounds. Federal Rule 12 lists seven defenses that can be raised by pre-answer motion.2Legal Information Institute. Federal Rules of Civil Procedure Rule 12 Most state courts follow a similar structure.
Jurisdiction and Venue
Lack of subject-matter jurisdiction means the court has no authority over this type of dispute. This defense is so fundamental that a court must dismiss whenever it discovers the problem, even late in the case.3Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Section: (h)(3) Lack of personal jurisdiction argues the court has no power over you as a defendant, which typically comes up when you have no meaningful connection to the state where the case was filed. Improper venue argues the case belongs somewhere else geographically, such as a district where neither party lives and where none of the underlying events happened.
Service Defects
Insufficient process attacks the legal documents themselves, such as a summons missing required information. Insufficient service of process attacks how the documents were delivered. Leaving the complaint with your neighbor when personal service was required is a classic service defect.
Failure to State a Claim
This is the most-used ground. It argues that even if everything the plaintiff alleges is true, no recognized legal theory supports a judgment in their favor. Vague or speculative claims that never reach a plausible entitlement to relief can be dismissed on this basis. Most contested motions to dismiss are fought here.
Failure to Join a Required Party
The seventh ground applies when someone who needs to be part of the lawsuit for a fair resolution has not been included.
Statute of Limitations
A limitations defense can support a motion to dismiss when the complaint itself shows the claim was filed too late. Courts treat this as a form of failure to state a claim. If the timing is not clear from the face of the complaint, the defense usually has to wait for a later stage of the case.
Include Every Defense You Have
Some of these grounds vanish forever if you leave them out of your first filing. If you file a motion to dismiss but skip personal jurisdiction, improper venue, or either service defect, you have waived those defenses permanently.4Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Section: (h)(1) The same waiver applies if you skip them in your answer when you do not file a motion at all.
You also cannot file a second motion to dismiss to pick up something you left out. If a defense was available when you filed your first motion and you omitted it, the rules bar you from raising it in a later motion.5Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Section: (g)(2)
Not every defense carries that risk. Failure to state a claim can be raised as late as trial, and subject-matter jurisdiction can be challenged at any point.6Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Section: (h)(2)-(3) Still, when you draft the motion, treat every available waivable defense as one you must include, even if you consider it secondary to your main argument.
The Documents You Need
Before drafting anything, pull the identifying details from the papers you were served with: full case name, case number, court name, and the assigned judge. Every document you file needs a caption block containing this information. Errors in the caption can get your filing rejected by the clerk.
The motion itself is a relatively short document. It names the grounds you are relying on, briefly describes the case, and asks the court for a specific ruling. Most courts expect a separate memorandum of law (sometimes called a memorandum of points and authorities) that carries the analysis, applying statutes and case law to the facts of your situation. Even when a separate memorandum is not strictly required, submitting one signals a serious filing.
Both documents must be signed. Federal rules require every motion to include the signer’s name, address, email, and phone number.7Legal Information Institute. Federal Rules of Civil Procedure Rule 11 If you are represented, your attorney signs; if you are representing yourself, you sign personally.
Many courts also expect a proposed order: a short document formatted for the judge’s signature that spells out the ruling you want. It mirrors the caption of your motion and contains direct language granting the dismissal. Judges are not required to use your proposed order as written, but providing one makes it easier for the court to rule your way. Check local rules for whether it is required or just encouraged.
A certificate of service confirms in writing that you sent copies of everything you filed to the opposing party or their attorney. It states what was served, on whom, when, and how. If you file electronically through the court’s system, no separate certificate is required because the system serves the other side automatically. If you serve by any other method, file a certificate with the court.8Legal Information Institute. Federal Rules of Civil Procedure Rule 5 – Section: (d)(1)(B)
Filing and Serving the Motion
In federal court, parties represented by an attorney must file electronically through CM/ECF (Case Management/Electronic Case Files) unless the court grants an exception.9Legal Information Institute. Federal Rules of Civil Procedure Rule 5 – Section: (d)(3)(A) Self-represented parties can e-file only if the local rules allow it; otherwise, you deliver documents to the clerk’s office in person or by mail.10United States Courts. Electronic Filing (CM/ECF)
After filing, you have to serve the opposing party. If the e-filing system is used and the other side is a registered user, the system handles service. Otherwise, use mail, email, or another method the court’s rules permit.
Most courts do not charge a separate filing fee for a motion to dismiss. In federal court, the initial case filing fee covers motions filed during the litigation. Some state courts charge modest motion fees, so check with the clerk if you are filing in state court.
What Happens After You File
Once the motion is served, the plaintiff has a set period to file a written opposition. The deadline varies by court; many federal districts allow 14 to 21 days, some up to 28. Depending on local practice, you may then get to file a short reply.
Something that catches defendants off guard: after you file, the plaintiff can amend the complaint as of right within 21 days, without asking the court’s permission. If they do, your motion likely becomes moot because the complaint it targeted no longer exists. You will need to evaluate the amended complaint and decide whether to file a new motion. Even after the 21-day window closes, courts are generally willing to grant permission to amend when fairness supports it.11Legal Information Institute. Federal Rules of Civil Procedure Rule 15 – Section: (a)(2)
Filing the motion does not pause the rest of the case. Discovery typically keeps moving while the motion is pending. If you want discovery halted, you have to ask for a separate stay and persuade the judge it is warranted. Courts grant these stays at their discretion.
The judge may schedule oral argument, but many decide motions to dismiss on the papers alone. Do not count on a hearing. The written motion has to stand on its own.
Possible Rulings
- Dismissed with prejudice. The case is over permanently, and the plaintiff cannot refile the same claims. Courts reserve this for defects no amendment could cure or legal flaws that are fundamental.12Legal Information Institute. With Prejudice
- Dismissed without prejudice. The case is dismissed but the plaintiff can fix the problems and try again. This is the more common outcome when a complaint fails to state a claim but the theory is not hopeless. Courts frequently dismiss without prejudice and grant leave to amend.
- Motion denied. The case moves forward, and you have 14 days from notice of the denial to file your answer unless the court orders otherwise.1Legal Information Institute. Federal Rules of Civil Procedure Rule 12 – Section: (a)(4)(A)
A denial is not a loss on the merits. It simply means the complaint is legally sufficient to proceed. You can still develop your defense through discovery, and many cases that survive a motion to dismiss end favorably for the defendant later.
File in Good Faith
Every motion you sign carries an implicit certification that it is backed by a reasonable legal argument and is not filed to harass, delay, or drive up costs. A court that finds a motion frivolous or filed for an improper purpose can impose sanctions, including penalties paid to the court and, in some cases, the other side’s attorney’s fees for responding.13Legal Information Institute. Federal Rules of Civil Procedure Rule 11 – Section: (c)
When sanctions are sought by the opposing party, federal rules provide a 21-day safe harbor. The party seeking sanctions must serve you with the motion first and give you 21 days to withdraw or fix the challenged filing before presenting it to the court.14Legal Information Institute. Federal Rules of Civil Procedure Rule 11 – Section: (c)(2) That safety net does not apply when the judge initiates sanctions. If your grounds feel thin, think carefully before filing. A motion that falls flat is one thing; one that invites sanctions is far worse.